RU2439295C1 - Method of bottomhole plunger pump operation - Google Patents

Abstract

FIELD: gas and oil production.

SUBSTANCE: pressure of extracted fluid in pump zone is monitored, pump performance is controlled by control station located on the surface. Pressure gauge is placed into extracted fluid collection chamber located between suction valve and plunger. Reciprocal plunger movement rate is regulated from the station by the gauge readings so that pressure in collection chamber does not fall below specified value.

EFFECT: increased performance of bottomhole plunger pump due to more compact filling of the chamber between plunger and suction valve at each plunger stroke.

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Description

The present invention relates to the oil industry, in particular to methods for oil and water using a deep plunger pump. The invention can be used to increase the operating efficiency of piston type surface pumps pumping gas-liquid mixtures.

In the deep plunger pump, when the plunger moves up, the pressure under the plunger decreases so that under the influence of the pressure drop that appears between the filling chamber and the intake in the pump, the suction valve opens. Downhole fluid enters the open valve, the chamber is filled. During oil production, the pressure at the intake of the plunger pump must be maintained above the saturation pressure of oil with associated gas R _nng so that free gas is not released and does not enter the filling chamber at the intake of the pump. If gas enters this chamber, the performance of the plunger pump is significantly reduced.

It is a well-known method for evaluating the degree of filling of the filling chamber of a deep plunger pump driven by a surface machine and a rod string by dynamometry on the ground surface of the rod string / 1 /. The method does not show the direct reason for the decrease in the flow rate of such a well in the form of the degree of decrease in pressure in the filling chamber relative to the threshold value P _nng . Moreover, the method is not applicable in those cases when the reciprocating action of the plunger pump is provided by a cable suspension / 2 / or a linear electric motor.

A device for measuring downhole parameters of produced fluid according to the patent of the Russian Federation No. 229108 (publ. March 27, 2005), according to which the environmental parameters are recorded above the pump or at the level of the reservoir. The method does not provide for the organization of pressure measurement in the filling chamber.

It is a well-known method of direct and indirect measurement of the pressure of a medium at the reception of a deep plunger pump / 3 / by lowering a pressure gauge on a wire (cable) or measuring the dynamic level of the liquid in the annulus. The method does not allow measuring the pressure in the filling chamber of the pump.

The aim of the invention is to increase the performance of the deep plunger pump due to a more complete filling of the chamber between the plunger and the suction valve at each stroke of the reciprocating movements of the plunger.

This goal is achieved by the fact that in known solutions for monitoring the pressure of the medium in the pump zone and controlling the pump capacity from the control station, it is necessary to place the pressure measurement sensor directly in the pump filling chamber, i.e. in the area between the plunger and the suction valve. This sensor is connected by an acceptable connection with the control station on the surface of the earth and, according to its indications, the frequency of the reciprocating movements of the pump plunger is controlled so that the pressure in the filling chamber does not decrease below a predetermined value, for example, below the pressure of oil saturation with gas.

The proposed technical solution is implemented according to the scheme in the drawing, where 1 is the body of the deep plunger pump, 2 is the pump plunger, 3 is the chamber for filling the produced fluid, 4 is the suction valve, 5 is the pressure measurement sensor, 6 is the control station for the drive of the deep pump, 7 is pump drive.

The method is carried out by performing the following operations. In the filling chamber 3 of the deep pump 1 between the plunger 2 and the suction valve 4, a pressure measuring sensor 5 is placed and connected with an acceptable connection to the control station 6. In the simplest case, this connection is an electric communication cable.

The submersible pump must have such an immersion under the dynamic level of the liquid and have such a capacity that would ensure a pressure exceeding P _nng at the pump _inlet . After a certain short time of operation of the pump, the sensor 5 in the chamber 3 measures the pressure during its filling. If this pressure is less than R _nng , then the control station 6 reduces the frequency of the reciprocating movements of the actuator 7, that is, increases the filling time of the chamber 3 by a certain amount, for example, 10% of the initial value. The increase in the time of filling the chamber 3 with produced oil or water will allow the liquid to fill the chamber 3 almost immediately after the plunger 2, without creating a zone with reduced pressure. The pressure between the plunger and the suction valve in this case will be reduced by an insignificant amount and will remain above P _nng . In the absence of the desired result according to the subsequent information of the sensor 5, the control station 6 makes a logical decision to reduce the performance of the plunger pump drive by another 10%.

Upon reaching an acceptable level of the coefficient of filling of the chamber 3 of the pump, the procedure for optimizing the performance of the downhole pump will be considered completed.

The most convenient and economically attractive our technical solution will be for a deep plunger pump, which is driven by a submersible linear electric motor. Using existing power cables, it will be possible to transmit information about the pressure in the pump filling chamber. The performance of the deep plunger pump will be increased due to a more complete filling of the chamber 3 of the pump while reducing the cost of power consumption of the pump drive.

Literature

1. Makhmudov S.A. Installation, operation and repair of downhole pumping units: Handbook of the master. - M .: Nedra, 1987. - P.106-108.

2. Operation of wells by pumps with wire rods / O.V. Puzanov, V. G. Karamyshev, R. Ya. Zagirov // Problems of the collection, preparation and transport of oil and oil products. - Sat-to scientific. tr - Ufa: TRANSTEC, 2004. - No. 63, - p. 116-119.

3. Vasilievsky V.N., Petrov A.I. Well Research Operator. Textbook for workers. - M .: Nedra, 1983. - S.225-226.

Claims (1)

A method of operating a deep plunger pump, which consists in organizing control of the pressure of the produced fluid in the pump zone and controlling the pump performance from the control station from the surface of the earth, characterized in that the pressure measuring sensor is placed in the filling chamber of the produced fluid between the suction valve and the plunger, and according to his testimony, the frequency of the reciprocating movements of the plunger is controlled from the control station so that the pressure in the filling chamber does not drop below Anna value.

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